וַתִּקַּ֨ח צִפֹּרָ֜ה צֹ֗ר וַתִּכְרֹת֙ אֶת־עָרְלַ֣ת בְּנָ֔הּ וַתַּגַּ֖ע לְרַגְלָ֑יו וַתֹּ֕אמֶר כִּ֧י חֲתַן־דָּמִ֛ים אַתָּ֖ה לִֽי׃
Then Zipporah took a flint, and cut off the foreskin of her son, and cast it at his feet; and she said: ‘Surely a bridegroom of blood art thou to me.’
Read halakhic rulings (Jewish law) on Exodus 4:25: and classical halakhic sources.